6
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
+39 0322 923372 - giacomini.com
Operation
Filter
Probe housing for thermal energy meter
C
Brass spacer for domestic cold water meter
Heat exchanger
E
Brass spacer for thermal energy meter
Thermostatic head with temperature probe
Probe housing for differential pressure control valve
Mechanical priority valve
Check valve
H
Brass spacer for domestic hot water meter
Manual air vent valve
Compact differential pressure control valve (GE556Y530 kit)
or double regulation diff. press. control valve (GE556Y532 kit)
Presetting valve (kit GE556Y544)
Water hammer arrestor
R
Circulator for domestic hot water recirculation
A
Domestic cold water outlet
B
Domestic cold water inlet
C
Domestic hot water outlet
D
Primary inlet
E
Primary outlet
F
High-temperature heating delivery
G
High-temperature heating return
H
Domestic hot water recirculation
WARNING.
When recirculation kit (GE556Y564/565) is included, install the
additional unit output for domestic cold water (GE556Y561) and reverse the
domestic cold water inlet/outlet flows (A and B).
It is also necessary to provide an expansion tank suitably sized according to the
volume of the recirculation system.
PRIMARY CIRCUIT: inlet: (D) and outlet (E).
The primary circuit includes two zones: one for heating control and the other for domestic
hot water production. The primary circuit includes a filter, a housing to install the probe of the differential pressure control valve, a
mechanical priority valve, a manual air vent valve, a brass spacer and a differential pressure control valve.
The brass spacer (Components - Ref. 6) can be replaced with a thermal energy meter by installing its temperature probe in the
matching housing (Components - Ref. 2).
The water from the boiler room enters the HIU and is generally channeled towards the heating secondary circuit.
When there is a demand for domestic hot water, the priority valve diverts the primary fluid towards the heat exchanger; a thermostatic
head controls and sets the required flow rate (when kit GE556Y522 is included).
DHW: cold water inlet (B), cold water outlet (A), hot water outlet (C).
The domestic water circuit includes a mechanical priority valve,
a check valve, a water hammer arrestor, a heat exchanger, a flow rate controller and a brass spacer (two spacers when kit GE556Y561
is included). The two brass spacers (Components - Ref. 12 and 15) can be replaced with a domestic cold/hot water meter.
A thermostatic head (when kit GE556Y522 is included) (Components - Ref. 10) controls and sets the domestic hot water temperature.
HIGH-TEMPERATURE HEATING: delivery (F) and return (G).
The high-temperature heating circuit includes a presetting valve with
optional installation of a thermo-electric actuator (when kit GE556Y544 is installed).
After flowing through the mechanical priority valve, the primary circuit hot water is channeled directly into the high-temperature
heating system.
C
H
E
H
D
G
C
E
F
R
B
A
C
H
E
B
D
G
C
A
E
F
C
H
E
H
D
G
C
E
F
R
B
A
C
H
E
B
D
G
C
A
E
F